放牧强度对短花针茅生活力及繁殖能力的影响

Effects of Grazing Intensities on Vitality and Reproductivity of Shortflower Needlegrass

短花针茅(Stipa breviflora)是短花针茅草原的建群植物,适于放牧,品质优良,对稳定此类型草地的生产力起着决定性作用。放牧利用直接影响到短花针茅的生活力和繁殖更新。本文是在进行了5年封闭式放牧试验的基础上,探讨了不同放牧强度在冬春季和夏秋季利用对短花针茅生活力和繁殖能力所产生的多方面影响,确定了此类草地适宜的载畜率为16～22亩/a·羊单位。

Shortflower needlegrass (Stipa breviflora) is the predominant plant of shortflower needlegrass steppe, and suitable for grazing. It performs a key function on stabilizing the productivity of this type of steppe. Grazing can directly affect the vitality and reproductivity of shortflower needlegrass. On the basis of five years fenced grazing experiment, effects different grazing intensities in tow grazing seasons on shortflower needlegrass vitality and reproductivity are discussed in this article. A rational stocking rate (1-1.5na/per year·sheep unit) on this steppe has been determined.